Hi
We are having the same issue with an upgrade we have just done recently.
I tried this in a stand alone AlloyDemo with A/B Testing and the issue is here also.
I tried to allow-scripts in chrome to see if that would get around it but it didn't.
I then tried to unpackage the 'Episerver.Marting.Testing.zip' and updating the sandbox parameter to allow-scripts and this has now worked. Although I don't think this is a solution but it gets around the issue you can read more about the issues here https://github.com/cburgmer/rasterizeHTML.js/wiki/Limitations and there is an issue listed here https://github.com/cburgmer/rasterizeHTML.js/issues/117.
Thanks
Seem to be getting a lot of 404 errors and "include.preload.js:344 Blocked script execution in 'about:blank' because the document's frame is sandboxed and the 'allow-scripts' permission is not set." from rasterizeHTML.js in the new A/B testing package.
Are these known bugs?